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Method for improving deinking performing of mixed office wastepaper

A technology of mixing office waste paper and deinked pulp, which is applied in waste paper processing, papermaking, paper recycling, etc., to achieve the effects of reducing keratinization, increasing water retention value, and improving whiteness

Active Publication Date: 2012-02-01
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of more and more difficulty in removing the above new type of ink, low whiteness of deinked pulp, many visible ink spots and high dustiness, the present invention provides a A method for improving whiteness, softness and physical strength properties of mixed office waste paper deinking pulp

Method used

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  • Method for improving deinking performing of mixed office wastepaper

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Effect test

Embodiment 1

[0025] Adopting this technology can improve the performance of deinked pulp of mixed office waste paper, reduce the amount of residual ink, correspondingly improve the whiteness of pulp, and reduce the horniness of pulp, which is manifested in the increase of water retention value, the strength of pulp, and the increase of bulk. big.

[0026] Example 2

[0027] The production of conventional mixed office waste paper is that the mixed office waste paper enters the pulping section after the raw materials are prepared. The pulping conditions are: the amount of NaOH is 1.2% of the mixed office waste paper, NaOH 2 SiO 3 The dosage is 2.4% of mixed office waste paper, H 2 o 2 The dosage is 1.2% of the mixed office waste paper, the amount of deinking agent is 0.5% of the mixed office waste paper, the pulping time is 18 minutes, the pulping concentration is 12%, and the stirring speed of the pulper is 1500 r / min. After pulping, it enters the deinking section. The deinking conditi...

Embodiment 2

[0030] Example 3

[0031] The production of conventional mixed office waste paper deinking pulp is that the mixed office waste paper enters the pulping section after preparation, and the pulping conditions are: the amount of NaOH is 1.1% of the mixed office waste paper, NaOH 2 SiO 3 The dosage is 2.2% of mixed office waste paper, H 2 o 2 The dosage is 1.1% of the mixed office waste paper, the amount of deinking agent is 0.8% of the mixed office waste paper, the pulping time is 25 min, the pulping concentration is 10%, and the stirring speed of the pulper is 1500 r / min. After pulping, it enters the deinking section. The deinking conditions are as follows: the amount of deinking agent is 0.3% of the dry pulp, the pulp concentration is 1.0%, and the time is 15 minutes. The flotation deinking process is adopted. After deinking, the pulp is washed and bleached. The bleaching process conditions are: the amount of NaOH is 1.0% of the dry pulp, and the NaOH 2 SiO 3 The dosage is...

Embodiment 3

[0034] The ionic liquid is recovered by distilling water and filtering impurities, and can be used continuously, saving energy and cost.

[0035] By using ionic liquid 1-allyl-3-methylimidazolium acetate to pretreat mixed office waste paper, the whiteness, water retention value, bulk, burst index, tensile index, and tear index of the pulp were all improved. There is a large degree of improvement, and the amount of residual ink is reduced. The Chinese invention patent with application number 201010543932.2 discloses the use of 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium acetate, 1-allyl-3-methylimidazolium chloride Chemicals are used to treat pulp to improve the whiteness of pulp. Before using the ionic liquid 1-allyl-3-methylimidazole acetate of the present invention, 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazole acetic acid Salt, 1-allyl-3-methylimidazolium chloride three kinds of ionic liquids have carried out the exploration to the ...

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Abstract

The invention relates to the technical field of recycling of wastepaper, in particular to a method for improving the deinking performance of mixed office wastepaper. The method comprises the following steps of: pretreating the mixed office wastepaper by using 1-allyl-3-methylimidazole acetate and NaOH; and smashing, washing, deinking and bleaching, wherein preferably, the using amount of the 1-allyl-3-methylimidazole acetate is 1 to 6 percent of the weight of the mixed office wastepaper, and the using amount of the NaOH is 0.1 to 0.3 percent of the weight of the mixed office wastepaper. The method has the advantages that: the 1-allyl-3-methylimidazole acetate has a high boiling point, does not have vapor pressure and is easy to recycle repeatedly in the using process; and printing ink is easy to remove in the subsequent deinking working section, the whiteness of paper pulp is improved, the problem of the cornification of the paper pulp is solved, the flexibility of fibers is improved, and the physical intensity of the paper pulp is improved.

Description

technical field [0001] The invention relates to the technical field of waste paper recycling, in particular to a method for improving the performance of mixed office waste paper deinking pulp. Background technique [0002] Waste paper is one of the main raw materials for pulp and papermaking. The recycling of waste paper can reduce the felling of wood, protect forest resources, save energy, reduce consumption, reduce pollution, increase efficiency, and improve the recycling rate of waste paper is one of the measures to achieve sustainable development of my country's paper industry. The long fiber content of office waste paper is high, and the original whiteness is high, which is an excellent fiber resource. Mixed office waste paper contains a wide range of waste paper, including electrostatic copy paper, laser printing waste paper, computer printing waste paper, account book waste paper, publication waste paper, heat-sensitive paper, pressure-sensitive paper and cardboard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 庞志强陈嘉川董翠华杨桂花刘玉王向强
Owner QILU UNIV OF TECH
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